Here are some usage examples for TRATW (Triple Rainbow, All The Way). (For more examples, see the Twitter page belonging to NathanFillion:)

The TV shows Castle and Firefly are so intense, they are TRATW. (Triple Rainbow, All The Way)."

The movie Serenity is so vivid, it's TRATW! (Triple Rainbow, All The Way!)

Nathan Fillion is so awesomely spectacular, sexyhotmessgorgeous, and brilliantly talented, his fame is sweeping across the nation, and over all the world! Nathan Fillion is full on Double Rainbow, even Triple Rainbow, All The Way!